Abstract
In the present work, we report on the behavior of synthesized gold nano-particles suspension, incorporated in titanium dioxide nanotube layers (TiO2- NT) and fabricated by electrochemical anodization in 0.4 wt% hydrofluoric acid solution and we study its photocatalytic response. Gold nanoparticles were characterized using Transmission electron microscopy and X-ray diffraction. Scanning electron microscopy was used to study the morphology of TiO2 nanotube layers doped by gold nanoparticles. Boosted photocatalytic performances on the degradation of an azo dye were obtained by using TiO2 nanotube layers doped by gold nanoparticles (Au/TiO2-NT), compared to undoped TiO2 nanotube layer (TiO2-NT) catalysts. Under UV irradiation, this new nanomaterial, with noble metal-semi conductor heterojunction (Au/ TiO2-NT) exhibits a synergetic effect in accelerating the electron transfert, resulting in an enhanced photoactivity recorded in the kinetics of degradation of Acid Orange 7 (AO7). Chronoamperometry was used to highlight higher photocurrent produced by gold-titania interface submited to UV irradiation.
Highlights
Nowadays, the use of nanostructured surfaces, in conjunction with nanoparticles is of growing interest
We report on the behavior of synthesized gold nanoparticles suspension, incorporated in titanium dioxide nanotube layers (TiO2NT) and fabricated by electrochemical anodization in 0.4 wt% hydrofluoric acid solution and we study its photocatalytic response
We observe the growth of ordered nanotube arrays grown on top of the Ti measuring approximately 84 nm in diameter
Summary
The use of nanostructured surfaces, in conjunction with nanoparticles is of growing interest. Titanium based nano-array systems establish inherent properties such as high surface area [21], controllable nanotube dimensions [22], tunable geometries and surface chemistry [23] and so forth. These additional and valuable new properties given by the nanostructuration lead to considering titanium dioxide nanotube arrays as suitable photocatalyst material. Photocurrent measurements and photodegradation experiments are used as a probe of the enhanced photocatalytic performance of the elaborated new nanocomposite
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